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Lecture14 - Outline CS11600 Introduction to Computer...

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1 CS11600: Introduction to Computer Programming (C++) Lecture 14 Svetlozar Nestorov University of Chicago 2/26/2003 Svetlozar Nestorov, CS 116: Intro to Programming II 2 Outline Inheritance Polymorphism Derived classes Static vs. dynamic binding Virtual functions 2/26/2003 Svetlozar Nestorov, CS 116: Intro to Programming II 3 Inheritance Inheritance – essential feature of OO. Implements i-sa hierarchies. • Derived class is-a Base class. When to use inheritance? • Different behavior vs. different value. Examples. 2/26/2003 Svetlozar Nestorov, CS 116: Intro to Programming II 4 Polymorphism Parametric: in ML. “Ad-hoc”: overloading. Object-oriented: • Invoking methods on an object without knowing its exact type (at compile time) results in correct behavior. Examples. 2/26/2003 Svetlozar Nestorov, CS 116: Intro to Programming II 5 Initialization Rules Constructors • Order: base, then derived. Derived : Base() {…} Destructors • Order: derived, then base.
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